Schumann wave itself is not directly acting on the sound or video products to improve the quality of sound quality, but the role of the space environment, people's physical and mental relaxation, improve the body's perception of sound and images, improve the health of the human body to improve the efficiency of work, mental stress also have a better effect. Features: This product is Schumann wave 7.83HZ very low frequency generator, features high accuracy and stability. High stable frequency acquisition elements: high stability pulse chip, precision correction capacitance, precision multi-loop adjustable resistor For more information please Google "Schumann Resonance". For audio-visual space - to enhance the sound field and audio-visual effects For the bedroom - to help sleep soothe the nerves, treatment of insomnia For the office - relax and improve work efficiency For the create space - to improve creative inspiration For the tea ceremony, spirituality, realization space - resting body and mind The Blue with Box Frequency: 7.83Hz Rated voltage: DC 5V Rated current: 0.5A Notice:the Switch only for the indicator light ON/OFF , The Transparent acrylic box need assembly it by yourself (The acrylic have the protective film) The Black without Box: Instructions: Take out the USB cable provided by the product, connect the round hole end to the circuit board, and plug the USB end to the power bank or USB charging head or other USB power supply devices to work; multiple working modes can be switched through the button: standby mode, high-power transmission mode, low power emission mode, lighting mode; Specifications and parameters: Circuit board size: 10*10cm Power supply interface: DC5.5*2.1 Supply voltage: 5V Rated power consumption: <1W Frequency: 7.83Hz